Geodesic
Representation varieties of finite index subgroups of Baumslag--Solitar groups
Trudy Instituta matematiki, Tome 23 (2015) no. 2, pp. 24-28.

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Representation varieties of finite index subgroups of Baumslag–Solitar groups are investigated. It is proved that all irreducible components of the representation variety of a finite index subgroup of a Baumslag–Solitar group are birational isomorphic to irreducible components of the representation variety of some another Baumslag–Solitar group. 
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V. V. Beniash-Kryvets; I. O. Govorushko. Representation varieties of finite index subgroups of Baumslag--Solitar groups. Trudy Instituta matematiki, Tome 23 (2015) no. 2, pp. 24-28. http://geodesic.mathdoc.fr/item/TIMB_2015_23_2_a2/

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